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water sources, the Applied Action Level from the California DOHS is the <br /> i applicable relevant and appropriate agency regulation (ARAB) for groundwater. <br /> As outlined in Section 4.5, this potential groundwater concentration at the <br /> well receptor may be translated into a soil naphthalene concentration on-site <br /> using the equation: <br /> Csoil - AAL/S <br /> where <br /> Csoil - maximum on-site soil naphthalene concentration <br /> S = soil/groundwater transport factor (g/ml) <br /> AAE, applied action level (0.018 mg/L) <br /> The calculated maximum on-site soil naphthalene concentration, Csoil 42 <br /> mg/kg.. <br /> Because all soil samples were analyzed for TPH and the cleanup level for <br /> site soils will be expressed in TPH (diesel), the calculated naphthalene <br /> standard was translated to a TPH standard by expressing naphthalene <br /> concentrations as a percentage of the measured TPH concentration. For soil <br /> samples in which both naphthalene and TPH concentrations were determined, <br /> naphthalene ranges from 0.01 to 0.2 percent of the TPH concentration (see <br /> Table 3-3)• If naphthalene is assumed to be- 0.2 percent of the TPH <br /> concentrations across the site, then the maximum allowable TPH concentration <br /> in soil that would not exceed the calculated naphthalene standard would be <br /> 21,000 mg/kg. This standard does not include exposure to any substance except <br /> E naphthalene but i's expected to be health conservative because the remedial <br /> investigations have shown that naphthalene was the most mobile and toxic of <br /> the substances found on-site. <br /> The allowable TPH diesel concentration calculated above was obtained <br /> without regard to other considerations necessary to the formulation of <br /> remedial objectives. Two other driving factors that must be considered when <br /> setting cleanup objectives are institutional acceptability and historical <br /> f <br /> i 4-10 <br /> GGA/0179b <br />